Wikipedia in English

Family history researchers are accustomed to searching among vital records, censuses, and other commonly used sources. But there are any number of more-obscure sources that can lead researchers to vital information, and Obscure Sources: Great Clues in Hidden Places will introduce you to them.

Bankruptcy records, special censuses, employment records, and coroners' records are only a few of the kinds of records you can turn to when other sources prove unfruitful.

Obscure Sources is an overview of a large number of sources that are often overlooked. It discusses where these records can be found, offers some options for locating these records through the Internet, and provides a selected bibliography of background information and methodology.